26521663420 has 24 divisors (see below), whose sum is σ = 63651992544. Its totient is φ = 9093141696.

The previous prime is 26521663411. The next prime is 26521663459. The reversal of 26521663420 is 2436612562.

It is a self number, because there is not a number n which added to its sum of digits gives 26521663420.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94720087 + ... + 94720366.

It is an arithmetic number, because the mean of its divisors is an integer number (2652166356).

Almost surely, 2^26521663420 is an apocalyptic number.

26521663420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26521663420 is an abundant number, since it is smaller than the sum of its proper divisors (37130329124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26521663420 is a wasteful number, since it uses less digits than its factorization.

26521663420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189440469 (or 189440467 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 26521663420 in words is "twenty-six billion, five hundred twenty-one million, six hundred sixty-three thousand, four hundred twenty".